How does a viral immunization prevent disease? a. the altered virus remains in the body and outcompetes the natural version if the virus returns. b. memory cells that develop in response to the weakened virus will respond more quickly if the virus returns. c. the nonspecific immune response will prevent the virus from entering the body. d. the altered virus remains in the body and recognizes itself if the virus returns.

Where is the picture at

The return of the wolf to yellowstone national park will probably affect the bird population to some degree, not significantly. while wolves will hunt birds when necessary, they prefer to hunt larger prey. the bird population will most likely only be affected when hunting is scarce for the wolves. birds of prey will also probably not be affected as much as other birds who spend more time on the ground hunting for food as the tend to spend more time in the air or in trees since they do not need to stay on the ground for long due to the nature of the way they hunt.